Comprehensive Guide to Software Testing: Unit, Integration, and System Testing Exercises with Selenium Java

Software testing is a crucial aspect of software development, ensuring that the software meets its specified requirements and behaves as expected. There are various types of testing, including unit testing, integration testing, and system testing. In this article, we’ll provide 9 training exercises for each type of testing and their respective answers using Selenium with Java.

EXERCISES

I. Unit testing exercises:

1. Test exception handling: Write test cases that verify that the system can handle and respond appropriately to various types of exceptions.
2. Test boundary conditions: Write test cases that verify the behavior of the system at the upper and lower limits of the inputs to ensure that it works as expected.
3. Test complex algorithms: Write test cases that verify the behavior of complex algorithms or mathematical calculations in the code.

II. Integration testing exercises:

1. Test inter-module communication: Write test cases that verify that different modules in the system can communicate and exchange data with each other correctly.
2. Test multi-threaded interactions: Write test cases that verify the behavior of the system when multiple threads are executing simultaneously.
3. Test database integration: Write test cases that verify the behavior of the system when it integrates with a database, including testing for data consistency and proper error handling.

III. System testing exercises:

1. Test end-to-end functionality: Write test cases that verify the behavior of the system from start to finish, including testing all inputs, processing, outputs, and interactions with external systems.
2. Test compatibility with different platforms: Write test cases that verify that the system works correctly on different platforms, including different operating systems and hardware configurations.
3. Test performance under stress: Write test cases that verify the behavior of the system under heavy load, including testing for performance bottlenecks and memory leaks.

ANSWERS TO THOSE EXERCISES

I. Answers to Unit testing exercises:

1. Test exception handling:

php

try {
  // code that throws an exception
} catch (Exception e) {
  Assert.assertEquals("Expected exception message", e.getMessage());
}

2. Test boundary conditions:

python

int input = Integer.MAX_VALUE;
int expectedOutput = -1;
int actualOutput = myFunction(input);
Assert.assertEquals(expectedOutput, actualOutput);

3. Test complex algorithms:

scss

double input1 = 0.5;
double input2 = 1.5;
double expectedOutput = 2.0;
double actualOutput = myComplexAlgorithm(input1, input2);
Assert.assertEquals(expectedOutput, actualOutput, 0.001);

II. Answers to Integration testing exercises:

1. Test inter-module communication:

javascript

String input = "hello";
String expectedOutput = "HELLO";
String actualOutput = myModule1.processString(input);
Assert.assertEquals(expectedOutput, actualOutput);

2. Test multi-threaded interactions:

scss

ExecutorService executor = Executors.newFixedThreadPool(2);
CountDownLatch latch = new CountDownLatch(2);
Runnable task1 = () -> {
  // code for thread 1
  latch.countDown();
};
Runnable task2 = () -> {
  // code for thread 2
  latch.countDown();
};
executor.execute(task1);
executor.execute(task2);
latch.await();
executor.shutdown();

3. Test database integration:

java

Connection connection = DriverManager.getConnection("jdbc:postgresql://localhost:5432/mydb", "user", "password");
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery("SELECT * FROM mytable");
int count = 0;
while (resultSet.next()) {
  count++;
}
Assert.assertEquals(100, count);

III. Answer to System testing exercises:

1. Test end-to-end functionality:

scss

WebDriver driver = new ChromeDriver();
driver.get("http://www.google.com");
WebElement searchBox = driver.findElement(By.name("q"));
searchBox.sendKeys("selenium");
searchBox.submit();
WebElement firstResult = driver.findElement(By.cssSelector("#rso > div:nth-child(1) > div > div > div > a"));
Assert.assertTrue(firstResult.getText().contains("Selenium"));
driver.quit();

2. Test compatibility with different platforms:

javascript

String osName = System.getProperty("os.name").toLowerCase();
if (osName.contains("mac")) {
  // code for Mac
} else if (osName.contains("windows")) {
  // code for Windows
} else {
  // code for other platforms
}

3. Test performance under stress:

java

long startTime = System.currentTimeMillis();
for (int i = 0; i< 100000; i++) {
  myFunctionUnderTest();
}
long endTime = System.currentTimeMillis();
long elapsedTime = endTime - startTime;
Assert.assertTrue(elapsedTime < 1000);
```

It’s important to note that these answers are just examples and may not cover all edge cases or considerations for each exercise. They should be modified and adapted to fit the specific requirements and use case of the software being tested. Additionally, testing best practices, such as maintaining a proper testing structure, organizing tests into logical groups, and following principles like “Don’t Repeat Yourself” (DRY), should be followed for best results.